ExtJs 3.4 - Not able to select text in text field in FireFox

ExtJs 3.4 - Not able to select text in text field in FireFox

I could not select the typed text in extjs text field on firefox. I can select the typed text in IE and chrome.The problem occurs only in FF.Any ideas or solution for this?i am aware that this issue was fixed in 4.x, but i need a work around in 3.x as i could not upgrade to 4.x.

The problem is in my framework. i have the following css which makes the text to be unselectable in firefox..unselectable { -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none;}But in IE and chrome, i can select the text in the text field. Only in firefox the problem occurs.PS: I am aware that above css will not allow user to select text in IE, chrome and firefox.